ブックマーク機能実装うまくいきません

Question

前提・実現したいこと

工程管理をメモできるアプリを作ってます。
views/static_pages/_user_logged_in.html.erbにブックマーク機能を表示させたいと思い、お気に入り機能実装中に下記のエラーが発生しました。
views/static_pages/_user_logged_in.html.erbをエラーなく、ブックマーク機能を表示させる為にはどうすればいいでしょうか。
教えて頂けると幸いです。宜しくお願いします。

発生している問題・エラーメッセージ

ActionView::Template::Error (undefined local variable or method `taskmemo' for #<#<Class:0x00007f43ae138e88>:0x00007f43ae0ff368>
Did you mean?  @taskmemo):
    1: <% if current_user.own?(taskmemo) %>
    2:    <%= render 'crud_menus', taskmemo: taskmemo %>
    3: <% else  %>
    4:    <%= render 'bookmark_area', taskmemo: taskmemo %>
  
app/views/bookmarks/_form_bookmark.html.erb:1
app/views/static_pages/_user_logged_in.html.erb:16
app/views/static_pages/home.html.erb:2

該当のソースコード

######db/migrate/20210310204824_create_bookmarks.rb

class CreateBookmarks < ActiveRecord::Migration[6.0]
  def change
    create_table :bookmarks do |t|
      t.references :user, foreign_key: true
      t.references :taskmemo, foreign_key: true

      t.timestamps
    end
    add_index :bookmarks, [:user_id, :taskmemo_id], unique: true
  end
end

######db/schema.rb

ActiveRecord::Schema.define(version: 2021_03_10_204824) do

  # These are extensions that must be enabled in order to support this database
  enable_extension "plpgsql"

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  create_table "bookmarks", force: :cascade do |t|
    t.bigint "user_id"
    t.bigint "taskmemo_id"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.index ["taskmemo_id"], name: "index_bookmarks_on_taskmemo_id"
    t.index ["user_id", "taskmemo_id"], name: "index_bookmarks_on_user_id_and_taskmemo_id", unique: true
    t.index ["user_id"], name: "index_bookmarks_on_user_id"
  end

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  create_table "taskmemos", force: :cascade do |t|
    t.string "product_name", limit: 30, null: false
    t.string "order_number", limit: 6, null: false
    t.datetime "delivery_date"
    t.integer "quantity"
    t.string "process"
    t.text "remarks"
    t.bigint "user_id"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.index ["user_id", "created_at"], name: "index_taskmemos_on_user_id_and_created_at"
    t.index ["user_id"], name: "index_taskmemos_on_user_id"
  end

  create_table "users", force: :cascade do |t|
    t.string "name", limit: 30, null: false
    t.string "email", null: false
    t.string "password_digest", null: false
    t.integer "user_id"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.string "remember_digest"
    t.string "activation_digest"
    t.boolean "activated", default: false
    t.datetime "activated_at"
    t.string "reset_digest"
    t.datetime "reset_sent_at"
    t.boolean "admin", default: false
    t.index ["email"], name: "index_users_on_email", unique: true
  end

  add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
  add_foreign_key "bookmarks", "taskmemos"
  add_foreign_key "bookmarks", "users"
  add_foreign_key "taskmemos", "users"
end

######memo/app/models/bookmak.rb

class SecondRelationship < ApplicationRecord
  belongs_to :user
  belongs_to :taskmemo
  # user_id と board_idの組み合わせを一意性のあるものにしている
  validates :user_id, uniqueness: { scope: taskmemo_id }
end

######memo/app/controllers/bookmarks_controller.rb

class BookmarkController < ApplicationController

  def create
    @taskmemo = Taskmemo.find(params[:taskmemo_id])
    current_user.bookmark(@taskmemo) # @taskmemoに
    # redirect_to taskmemos_path, success: t('success')
  end

  def destroy
    @taskmemo = current_user.bookmarks.find(params[:id]).taskmemo
    current_user.unbookmark(@taskmemo) #@taskmemoに
  end
end

######memo/app/models/taskmemo.rb

class Taskmemo < ApplicationRecord

  belongs_to :user
  has_one_attached :image
  default_scope -> { order(created_at: :desc) }
  validates :user_id, presence: true

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  has_many :bookmarks, dependent: :destroy

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  def feed
    bookmarking_ids = "SELECT bookmarked_id FROM second_relationships
                       WHERE bookmark_id = :taskmemo_id"
    Taskmemo.where("taskmemo_id IN (#{bookmarking_ids})
                    OR taskmemo_id = :taskmemo_id", taskmemo_id: id)
  end
end

######memo/app/controllers/taskmemos_controller.rb

class TaskmemosController < ApplicationController
　before_action :logged_in_user, only: [:create, :destroy,
                                      　:bookmarked, :bookmarks]
  before_action :correct_user, only: :destroy


  def index
    @taskmemos = current_user.taskmemos
  end

  def show
    @taskmemo = current_user.taskmemos.find(params[:id])
  end

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  def bookmarks
    @bookmark_taskmemos = current_user.bookmarks.includes(:user).order(created_at: :desc)
  end

  private

  def taskmemo_params
    params.require(:taskmemo).permit(:product_name, :order_number,
                                     :delivery_date, :quantity,
                                     :process, :remarks, :image)
  end

  def correct_user
    @taskmemo = current_user.taskmemos.find_by(id: params[:id])
    redirect_to root_url if @taskmemo.nil?
  end
end

######memo/app/controllers/users_controller

class UsersController < ApplicationController
  before_action :logged_in_user, only: [:index, :edit, :update, :destroy,
                                        :following, :follwers]
  before_action :correct_user, only: [:edit, :update]
  before_action :admin_user, only: [:index, :destroy]

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  def show
    @user = User.find(params[:id])
    @taskmemos = @user.taskmemos.paginate(page: params[:page])
  end

  
  private

    def user_params
      params.require(:user).permit(:name, :email, :password,
                                  :password_confirmation)
    end

    # beforeアクション

    def correct_user
      @user = User.find(params[:id])
      redirect_to(root_url) unless current_user?(@user)
    end

    def admin_user
      redirect_to(root_url) unless current_user.admin?
    end
end

######memo/app/models/user.rb

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  has_many :taskmemos, dependent: :destroy

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  has_many :bookmarks, dependent: :destroy

  has_many :bookmarks_taskmemos, through: :bookmarks, source: :taskmemo

  def own?(object)
    id == object.user_id
  end

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  def feed
    following_ids = "SELECT followed_id FROM relationships
                     WHERE follower_id = :user_id"
    Taskmemo.where("user_id IN (#{following_ids})
                    OR user_id = :user_id", user_id: id)
  end

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  def own?(object)
    id == object.user_id
  end

  def bookmark?(taskmemo)
    bookmark_taskmemos.include?(taskmemo)
  end

  def bookmark(taskmemo)
    bookmark_taskmemos << taskmemo
  end

  def unbookmark(taskmemo)
    bookmark_taskmemos.destroy(taskmemo)
  end

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end

#####memo/app/controllers/static_pages_controller.rb

class StaticPagesController < ApplicationController
  def home
    if logged_in?
      @taskmemo = current_user.taskmemos.build
      @feed_items = current_user.feed.paginate(page: params[:page])
    end
  end

  def help
  end

  def about
  end

  def contact
  end
end

######memo/app/views/static_pages/_user_logged_in.html.erb

<div class="row">
  <aside class="col-md-4">
    <section class="user_info">
      <%= render 'shared/user_info' %>
    </section>
    <section class= "stats">
      <%= render 'shared/stats' %>
    </section>
    <section class="taskmemo_form">
      <%= render 'shared/taskmemo_form' %>
    </section>
  </aside>
  <div class="col-md-8">
    <h3>製品一覧</h3>
    <%= render 'shared/feed' %>
    <%= render 'bookmarks/form_bookmark' %>
  </div>
</div>

######memo/app/views/bookmarks/_form_bookmark.html.erb

<% if current_user.own?(taskmemo) %>
   <%= render 'crud_menus', taskmemo: taskmemo %>
<% else  %>
   <%= render 'bookmark_area', taskmemo: taskmemo %>
<%  end %>

######memo/app/views/bookmarks/_bookmark_area.html.erb

<% if current_user.bookmark?(taskmemo) %>
  <%= render 'unbookmark', taskmemo: taskmemo %>
<% else %>
  <%= render 'bookmark', taskmemo: taskmemo %>
<% end %>

######memo/app/views/bookmarks/_bookmark.html.erb

<%= link_to bookmarks_path(taskmemo_id: taskmemo.id),
    id: "js-bookmark-button-for-taskmemo-#{taskmemo.id}",
    class: "float-right", method: :post, remote: true do %>
  <%= icon 'far', 'ster' %>
<% end %>

######memo/app/views/bookmarks/_unbookmark.html.erb

<%= link_to bookmark_path(current_user.bookmarks.find_by(taskmemo_id: taskmemo.id)),
    id: "js-bookmark-button-for-taskmemo-#{taskmemo.id}",
    class: "float-right", method: :delete, remote: true do %>
  <%= icon 'fas', 'star' %>
<% end %>

試したこと

userテーブル、taskmemosテーブル、bookmarkテーブルの一通りの関連づけ。
bookmark機能の一通りの実装。

補足情報（FW/ツールのバージョンなど）

ruby 2.7.1p83
Rails 6.0.3.4
Ubuntu 20.04 LTS

Comments

[winterboum]

肝心な　static_pages_controller.rb　が省略されちゃって。
載せて

Answer 1

StaticPagesController の home アクションで @taskmemo をセットしていますね。
memo/app/views/bookmarks/_form_bookmark.html.erb ではこのインスタンス変数ではなくローカル変数 taskmemo を使っています。
これができるためには，この部分テンプレートを呼び出す
memo/app/views/static_pages/_user_logged_in.html.erb
において，

render 'bookmarks/form_bookmark'

ではなく

render 'bookmarks/form_bookmark', taskmemo: @taskmemo

としなければならないと思います。